Pretty sure i saw a project (maybe on Hackaday?) that gutted a Steam Deck and made an opposite sort of device where it was meant to be a mini desktop box (with no display, etc). But yeah, I guess the same thing could be done to get it into a uConsole form factor, though it would require a lot of expertise with 3D printing and maybe some expert level hardware hacking and redesign since the form factor may not fit well. It would be kind of overkill performance-wise though, but i guess would have good battery life if throttled down all the way.
GPD devices seem like the closest existing actual products, though they are somewhere between really small laptops, or really powerful modern Handheld PCs.
This thread might offer more options, but most are custom designs by folks with the hardware and design experience required to make their own:
Competitors to the uConsole like the Pilet are going to probably have the same platform limitations since they are CM4 or CM5 based. And there’s also the chance they might be vaporware or not live uo to their marketing, etc.
Aliexpress has some X86 based handheld mini laptop devices as well, but they seem to go even further back in time and use 8086 or maybe 286/386/486 compatible processors and memory that matches that era. So i doubt they’d be useful for this either. (I’m actually not sure what those devices are useful for, beyond being curiosities and sort of weirdly cool.)